Quic Storage Rack store SCBA cylinders and fire extinguishers conveniently and safely. Each unit measures 7.75" square x 23" long and holds one cylinder. The units bolt together and stack horizontally. Each unit has one cradle and rubber bumper stops to keep your cylinders in position. When one unit is placed on top of another, the bottom box may be ordered "less top" since the bottom of the upper box becomes the top of the lower box. Yellow PVC coated finish.